(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ decrease in entropy occurs when the system becomes more ordered,such as

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$CaO_{(s)} + CO_{2(g)} \longrightarrow CaCO_{3(s)}$

(D) Entropy $(S)$ is a measure of the randomness or disorder of a system. $A$ decrease in entropy occurs when the system becomes more ordered,such as when gas molecules are consumed to form a solid.In option $D$,$CaO_{(s)} + CO_{2(g)} \longrightarrow CaCO_{3(s)}$,one mole of gas $(CO_2)$ is consumed to form a solid product $(CaCO_3)$.Since the number of moles of gaseous species decreases from $1$ to $0$,the randomness of the system decreases,leading to a decrease in entropy $(\Delta S < 0)$.

Class 11 Chemistry Thermodynamics 2 nd Law of thermodynamics and Entropy

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Which one of the following involves a decrease in entropy?

AP EAMCET 2017 All AP EAMCET

A
$2 NaHCO_{3(s)} \longrightarrow Na_2CO_{3(s)} + CO_{2(g)} + H_2O_{(g)}$
B
$CCl_{4(s)} \longrightarrow CCl_{4(l)}$
C
$Zn_{(s)} + 2 HCl_{(aq)} \longrightarrow ZnCl_{2(aq)} + H_{2(g)}$
D
$CaO_{(s)} + CO_{2(g)} \longrightarrow CaCO_{3(s)}$

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Thermodynamics

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2 nd Law of thermodynamics and Entropy

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One mole of water at $100\,^{\circ}C$ is converted into steam at $100\,^{\circ}C$ at a constant pressure of $1\,atm$. The change in entropy is [heat of vaporisation of water at $100\,^{\circ}C = 540\,cal/g$].

Medium

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Statement-$1$: For a process at equilibrium,the total entropy is maximum and the change in total entropy is zero.
Statement-$2$: For a reversible process,if the same amount of heat is supplied to a system at two different temperatures,then the entropy change is less at a lower temperature.

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The enthalpy of vapourization of a liquid is $30 \ kJ \ mol^{-1}$ and entropy of vapourization is $75 \ J \ mol^{-1} \ K^{-1}$. The boiling point of the liquid at $1 \ atm$ is.......$K$

MediumIIT 2004

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$STATEMENT-1:$ There is a natural asymmetry between converting work to heat and converting heat to work.
$STATEMENT-2:$ No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.

MediumIIT 2008

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Entropy is maximum in case of

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Which one of the following involves a decrease in entropy?

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One mole of water at $100\,^{\circ}C$ is converted into steam at $100\,^{\circ}C$ at a constant pressure of $1\,atm$. The change in entropy is [heat of vaporisation of water at $100\,^{\circ}C = 540\,cal/g$].

Statement-$1$: For a process at equilibrium,the total entropy is maximum and the change in total entropy is zero.Statement-$2$: For a reversible process,if the same amount of heat is supplied to a system at two different temperatures,then the entropy change is less at a lower temperature.

The enthalpy of vapourization of a liquid is $30 \ kJ \ mol^{-1}$ and entropy of vapourization is $75 \ J \ mol^{-1} \ K^{-1}$. The boiling point of the liquid at $1 \ atm$ is.......$K$

$STATEMENT-1:$ There is a natural asymmetry between converting work to heat and converting heat to work.$STATEMENT-2:$ No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.

Entropy is maximum in case of

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Statement-$1$: For a process at equilibrium,the total entropy is maximum and the change in total entropy is zero.
Statement-$2$: For a reversible process,if the same amount of heat is supplied to a system at two different temperatures,then the entropy change is less at a lower temperature.

$STATEMENT-1:$ There is a natural asymmetry between converting work to heat and converting heat to work.
$STATEMENT-2:$ No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work.